Computer Networking
A protocol is a set of rules governing a time sequence of events that must take place

between peers
between an interface
across an interface
between modems
None of these

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Computer Networking
HDLC (High-level Data Link Control) is

a method access control technique for multiple-access transmission media
None of these
network access standard for connecting stations to a circuit-switched network
a method of determining which device has access to the transmission medium at any time
a very common bit-oriented data link protocol issued by ISO.

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